Smooth out your quilt on a big table. When you have it wrinkle free, secure the edges with painter's tape to hold it down. You can use the big bull dog clamps on the table edge (if they will fit) to hold the quilt down too. If you have a big curved needle (come in a pkg. for tent mending) use that if not a big straight needle will work. Thread the needle with a long piece of embroidery thread or yarn. Start on one side taking a 1/4 in. stitch from the top, through the layers and back to the top. Do not cut the thread but go over about 3-4 in. and do another stitch, working all across the width of the quilt. You cut the thread between the stitches after the whole line is done and tie the ends with a square knot. Continue untill the whole quilt is done.
Some people like to forgo the table and place the quilt to be tied on their Q-snap frame and do it that way. Others do it on the floor but you have to use an old surface as the needle can scratch the surface/floor.